Material Specifications Flashcards

In New England state DOT specifications, what is the maximum sodium sulfate soundness loss typically permitted for coarse aggregate used in pavement surface courses?

Answer: 12%

Most New England DOT specifications limit sodium sulfate soundness loss to 12% for coarse aggregate in pavement surface courses to ensure freeze-thaw durability.

Which ASTM designation governs the specification for deformed and plain steel bars for concrete reinforcement (rebar)?

Answer: ASTM A615

ASTM A615 is the standard specification for deformed and plain carbon-steel bars used as concrete reinforcement.

For corrugated metal pipe (CMP) used in drainage culverts, what property is specified by AASHTO M 36?

Answer: Corrugated steel pipe dimensions, coating, and wall thickness

AASHTO M 36 specifies the dimensions, wall thickness, corrugation profile, and coating requirements for corrugated steel pipe.

What is the minimum California Bearing Ratio (CBR) typically required for subbase material per AASHTO specifications?

Answer: 20%

AASHTO typically requires a minimum CBR of 20% for granular subbase material to provide adequate support for the pavement structure.

Epoxy-coated reinforcing bars used in bridge decks must meet which ASTM specification?

Answer: ASTM A775

ASTM A775 covers epoxy-coated steel reinforcing bars where the coating is applied after fabrication of the bar.

In the context of highway paint markings, which retroreflectivity standard is referenced in AASHTO specifications for new pavement markings?

Answer: ASTM E1710

ASTM E1710 is the standard test method for measuring retroreflectivity of pavement markings using a portable retroreflectometer.

What aggregate property is determined by AASHTO T 84 and T 85?

Answer: Specific gravity and absorption of fine and coarse aggregate respectively

AASHTO T 84 measures specific gravity and absorption of fine aggregate, while T 85 covers coarse aggregate.